JEE Main & Advanced Sample Paper JEE Main Sample Paper-47

  • question_answer
    Increasing value of magnetic moment of the following species is
    (i) \[{{[Fe{{(CN)}_{6}}]}^{4-}}\]
    (ii) \[{{[Fe{{(CN)}_{6}}]}^{3-}}\]
    (iii) \[{{[Cr{{(N{{H}_{3}})}_{6}}]}^{3+}}\]
    (iv) \[{{[Ni{{({{H}_{2}}O)}_{6}}]}^{2+}}\]

    A)  I < II < III < IV                     

    B)  IV < III < II < I

    C)  II < III < I < IV                     

    D)  I < II < IV < III

    Correct Answer: D

    Solution :

     Magnetic moment \[\propto \] number of unpaired electrons Number of unpaired electrons in the below species are (I) \[{{[Fe{{(CN)}_{6}}]}^{4-}}=0;\]       (II) \[{{[Fe{{(CN)}_{6}}]}^{3-}}=1\] (III) \[{{[Cr(N{{H}_{6}})]}^{3+}}=3;\]   (IV) \[{{[Ni{{({{H}_{2}}O)}_{6}}]}^{2+}}=2\] Hence, the correct order is I < II < IV < III

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